Alert archive / Colorado / Denver County

Weather alerts in Denver County, Colorado, 2014

131 weather alerts in 2014, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Denver County and its neighbors

Each county as a circle sized by its count in 2014. Tap one for its archive.

Alerts
131
Warnings
32
Watches
20
Advisories
34
Busiest month
May36 alerts
Busiest day
May 21, 20148 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

2 of 6 tornado warnings covering Denver County in 2014 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 34 minutes after it went out.

Denver County, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings6267%1100%34 min
Severe thunderstorm warnings191426%1369%15 min
Flash flood warnings010%

Each office's whole area, 2014

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Denver/Boulder, CO: tornado warnings832372%5663%13 min
NWS Denver/Boulder, CO: severe thunderstorm warnings2779466%29363%16 min
NWS Denver/Boulder, CO: flash flood warnings41978%2259%33 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

The alerts

Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 3, 4:10 AM MSTWinter Weather AdvisoryBOU48 hr
Jan 28, 3:36 PM MSTWinter Storm WarningBOU61 hr
Jan 29, 3:22 PM MSTWinter Storm WatchBOU14 hr
Jan 30, 6:40 PM MSTMesoscale DiscussionSPC5 hr
Jan 31, 11:08 AM MSTWinter Weather AdvisoryBOU18 hr
Feb 2, 7:17 AM MSTDense Fog AdvisoryBOU103 min
Feb 5, 12:22 AM MSTWind Chill AdvisoryBOU11 hr
Feb 5, 2:44 PM MSTWind Chill AdvisoryBOU20 hr
Feb 10, 4:24 AM MSTDense Fog AdvisoryBOU5 hr
Feb 23, 11:26 PM MSTDense Fog AdvisoryBOU10 hr
Mar 4, 2:44 PM MSTWinter Weather AdvisoryBOU11 hr
Mar 6, 4:58 AM MSTWinter Weather AdvisoryBOU45 hr
Mar 30, 9:49 PM MDTSpecial Weather StatementBOU41 min
Apr 2, 4:32 AM MDTWinter Weather AdvisoryBOU31 hr
Apr 11, 2:50 PM MDTWinter Storm WatchBOU25 hr
Apr 12, 3:51 PM MDTWinter Weather AdvisoryBOU32 hr
Apr 25, 3:38 PM MDTRed Flag WarningBOU28 hr
Apr 28, 9:00 PM MDTHigh Wind WarningBOU23 hr
May 7, 12:37 PM MDTSevere Thunderstorm WatchSPC7 hr
May 7, 7:44 PM MDTSevere Thunderstorm WarningBOU31 min
May 7, 8:02 PM MDTSevere Thunderstorm WarningBOU28 min
May 8, 3:58 PM MDTSpecial Weather StatementBOU32 min
May 9, 4:30 AM MDTWinter Storm WatchBOU49 hr
May 9, 5:28 AM MDTDense Fog AdvisoryBOU4 hr
May 10, 6:00 AM MDTWinter Storm WarningBOU54 hr
May 12, 4:32 AM MDTFreeze WarningBOU27 hr
May 13, 3:14 PM MDTFreeze WarningBOU16 hr
May 20, 2:08 PM MDTMesoscale DiscussionSPC67 min
May 20, 2:31 PM MDTSevere Thunderstorm WatchSPC6 hr
May 20, 2:33 PM MDTSevere Thunderstorm WarningBOU42 min
May 20, 3:15 PM MDTSevere Thunderstorm WarningBOU45 min
May 20, 4:50 PM MDTMesoscale DiscussionSPC85 min
May 21, 12:09 PM MDTMesoscale DiscussionSPC96 min
May 21, 12:34 PM MDTTornado WatchSPC8 hr
May 21, 1:36 PM MDTSevere Thunderstorm WarningBOU39 min
May 21, 1:56 PM MDTTornado WarningBOU34 min
May 21, 1:58 PM MDTMesoscale DiscussionSPC62 min
May 21, 2:21 PM MDTSevere Thunderstorm WarningBOU39 min
May 21, 2:23 PM MDTTornado WarningBOU22 min
May 21, 3:18 PM MDTTornado Warning Tornado observedBOU27 min
May 22, 12:07 PM MDTMesoscale DiscussionSPC83 min
May 22, 12:34 PM MDTSevere Thunderstorm WatchSPC6 hr
May 22, 2:42 PM MDTTornado WarningBOU33 min
May 22, 2:55 PM MDTSevere Thunderstorm WarningBOU50 min
May 22, 4:43 PM MDTAreal Flood AdvisoryBOU3 hr
May 22, 5:18 PM MDTAreal Flood AdvisoryBOU3 hr
May 23, 2:51 PM MDTSpecial Weather StatementBOU39 min
May 23, 6:05 PM MDTAreal Flood AdvisoryBOU115 min
May 23, 10:26 PM MDTAreal Flood AdvisoryBOU3 hr
May 24, 5:50 AM MDTFlash Flood WatchBOU17 hr
May 25, 2:02 PM MDTMesoscale DiscussionSPC88 min
May 25, 3:13 PM MDTSpecial Weather StatementBOU32 min
May 30, 5:17 AM MDTFlash Flood WatchBOU15 hr
May 31, 1:34 PM MDTMesoscale DiscussionSPC116 min
Jun 5, 2:25 PM MDTMesoscale DiscussionSPC95 min
Jun 5, 4:27 PM MDTSpecial Weather StatementBOU33 min
Jun 5, 4:55 PM MDTSevere Thunderstorm WarningBOU35 min
Jun 5, 5:51 PM MDTSevere Thunderstorm WarningBOU24 min
Jun 5, 6:37 PM MDTMesoscale DiscussionSPC113 min
Jun 6, 11:56 AM MDTMesoscale DiscussionSPC2 hr
Jun 6, 12:38 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 6, 2:32 PM MDTMesoscale DiscussionSPC58 min
Jun 8, 11:31 AM MDTMesoscale DiscussionSPC89 min
Jun 8, 12:19 PM MDTTornado WatchSPC8 hr
Jun 12, 1:44 PM MDTMesoscale DiscussionSPC91 min
Jun 12, 5:11 PM MDTSpecial Weather StatementBOU34 min
Jun 14, 2:29 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 14, 3:00 PM MDTSevere Thunderstorm WarningBOU30 min
Jun 14, 3:20 PM MDTSpecial Weather StatementBOU25 min
Jun 14, 3:28 PM MDTSevere Thunderstorm WarningBOU32 min
Jun 18, 6:28 PM MDTSpecial Weather StatementBOU32 min
Jun 18, 6:57 PM MDTSpecial Weather StatementBOU33 min
Jun 18, 7:06 PM MDTSevere Thunderstorm WarningBOU24 min
Jun 22, 1:22 PM MDTMesoscale DiscussionSPC113 min
Jun 23, 1:39 PM MDTMesoscale DiscussionSPC2 hr
Jun 23, 4:06 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 23, 6:11 PM MDTSevere Thunderstorm WarningBOU34 min
Jun 23, 6:17 PM MDTTornado WarningBOU28 min
Jun 24, 2:44 PM MDTSevere Thunderstorm WatchSPC7 hr
Jun 24, 7:45 PM MDTSevere Thunderstorm WarningBOU30 min
Jun 25, 1:28 PM MDTMesoscale DiscussionSPC2 hr
Jun 26, 2:07 PM MDTMesoscale DiscussionSPC53 min
Jun 26, 3:39 PM MDTSevere Thunderstorm WarningBOU36 min
Jul 7, 8:05 PM MDTSevere Thunderstorm WarningBOU25 min
Jul 7, 8:28 PM MDTSevere Thunderstorm WarningBOU32 min
Jul 7, 8:34 PM MDTMesoscale DiscussionSPC56 min
Jul 9, 4:42 PM MDTSevere Thunderstorm WatchSPC9 hr
Jul 11, 3:35 PM MDTAreal Flood AdvisoryBOU115 min
Jul 11, 3:49 PM MDTAreal Flood AdvisoryBOU116 min
Jul 11, 4:20 PM MDTAreal Flood AdvisoryBOU3 hr
Jul 12, 10:41 AM MDTFlash Flood WatchBOU10 hr
Jul 14, 11:48 AM MDTMesoscale DiscussionSPC57 min
Jul 14, 12:59 PM MDTSevere Thunderstorm WatchSPC6 hr
Jul 14, 6:03 PM MDTMesoscale DiscussionSPC87 min
Jul 15, 1:29 PM MDTMesoscale DiscussionSPC3 hr
Jul 16, 12:33 PM MDTMesoscale DiscussionSPC87 min
Jul 20, 5:58 PM MDTSpecial Weather StatementBOU47 min
Jul 24, 12:31 PM MDTAreal Flood AdvisoryBOU119 min
Jul 24, 12:55 PM MDTSpecial Weather StatementBOU35 min
Jul 24, 1:39 PM MDTSpecial Weather StatementBOU36 min
Jul 25, 2:50 PM MDTSpecial Weather StatementBOU25 min
Jul 28, 1:37 PM MDTFlash Flood WatchBOU52 hr
Jul 28, 4:02 PM MDTTornado WarningBOU28 min
Jul 28, 4:20 PM MDTAreal Flood AdvisoryBOU3 hr
Jul 29, 2:42 PM MDTAreal Flood AdvisoryBOU3 hr
Jul 29, 3:08 PM MDTAreal Flood AdvisoryBOU3 hr
Aug 9, 3:42 PM MDTMesoscale DiscussionSPC63 min
Aug 23, 1:07 PM MDTMesoscale DiscussionSPC113 min
Aug 25, 2:37 PM MDTMesoscale DiscussionSPC113 min
Aug 25, 7:43 PM MDTMesoscale DiscussionSPC92 min
Aug 26, 1:11 AM MDTAreal Flood AdvisoryBOU94 min
Aug 26, 2:12 PM MDTMesoscale DiscussionSPC2 hr
Aug 26, 2:30 PM MDTAreal Flood AdvisoryBOU2 hr
Aug 27, 1:37 PM MDTMesoscale DiscussionSPC113 min
Aug 29, 2:49 PM MDTSpecial Weather StatementBOU41 min
Sep 12, 10:22 AM MDTFrost AdvisoryBOU21 hr
Sep 22, 2:48 PM MDTMesoscale DiscussionSPC117 min
Sep 29, 1:19 PM MDTMesoscale DiscussionSPC56 min
Sep 29, 2:39 PM MDTSevere Thunderstorm WarningBOU66 min
Oct 1, 3:23 PM MDTSevere Thunderstorm WarningBOU52 min
Oct 2, 2:57 PM MDTFrost AdvisoryBOU17 hr
Oct 3, 3:27 PM MDTFrost AdvisoryBOU18 hr
Oct 12, 8:05 PM MDTFrost AdvisoryBOU12 hr
Oct 13, 10:06 AM MDTFrost AdvisoryBOU22 hr
Oct 26, 3:14 PM MDTFreeze WatchBOU23 hr
Oct 27, 2:21 PM MDTFreeze WarningBOU18 hr
Nov 12, 2:35 AM MSTWinter Weather AdvisoryBOU15 hr
Nov 12, 5:12 PM MSTWind Chill AdvisoryBOU16 hr
Dec 24, 5:43 AM MSTWinter Storm WatchBOU9 hr
Dec 24, 2:38 PM MSTWinter Weather AdvisoryBOU37 hr
Dec 28, 10:36 AM MSTWinter Weather AdvisoryBOU43 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20132015

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.